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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2075529e6056b58eaa3a64704f3ef2549ac936962c54087e9acb89752c428fd1' 
  AND token = 'NUoZZl0joDUudH0jXoaE2cPQGFuvcuQoTCL6K73Q+do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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