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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85497ef1ec533dc12fd4f9970e74daf4a3f4744223e74e1d1133fd54bb56ae0' 
  AND token = 'nbOt1pykFaGFbL9CmzkB6bheHrWTmE1mKDfESC/5QEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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