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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c41b39a0c0dd9093abcffee09c184ca0b7a2411bcb022e6ff1c6e6e025b17da' 
  AND token = 'eoUK7kuoEUzWEzoawOgjkcX4wb4OgpCsQor3wHMIpRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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