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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51423fb7fead5a94d7dbdfe62a1fbae470cd6fa285682e13f018eb311d4542cd' 
  AND token = 'y/LZOWIQENfw0mgRRDpdWq82Nh6Jt2L5rY2Mau0fTf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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