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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ae0fc93bd0df3e97171d5a61de80087af3cbdf54cafdff6d2fd60cecd5f55e' 
  AND token = '/k5M8J1X25VjNQ4ODqR3gjgkHqtwXZC8pdb3t+dcn44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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