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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea76923ee8986814fe7f57a693a32d4819dc2d738299bf4d34e7da8b0930337b' 
  AND token = '713TLr+NHkWw1SnVokPLJqR2XgxK7Kadz76wjU/RK74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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