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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628fcb4b2efe9d3e218460f9fb61ec2c81a8f12e4b66e90a384a29f4cb769299' 
  AND token = '3ub8dP4J9vVbVc/SirR8ONJ3j/K2YuoA25PSY8jzUa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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