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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233fef7d46ff5bd19f7c4b29040b2edc385ff477cdffd1a283a9c9cb29c3d4d4' 
  AND token = 'WsaQo0IsvI3Hh1sXhvFV7xL0wVQz6QEYyjrfKLjokRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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