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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb6df162a2972cb2f0db41b8e1d64a8e047fca039a8cef3f7d0b74c4365452f' 
  AND token = 'xe5z3Mqd5hatO/ENtK5x3XyNvbrhXcvayEZRXxyPMg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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