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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485608d94a2c29091c6422b4db1528500c3c17cfde0e4d87d252315cbce44764' 
  AND token = 'bjTKympa0gROdpsXmKRos2neEyCtuhRtQPkLQVlD36s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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