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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d92d23b945f7bf854fb6a45c1949a9acdeef2c644c2653108dd665f69c2a0c9' 
  AND token = '2DBNz3CaqivMVfUpVOnBlb6sb6KmrfXUDqN7OLby+Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}