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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9603b2c0d738a5dbe44e2a42baffd0b99c5328efc80b7bc428156670f6af8d4' 
  AND token = '1Bg9x0BqrKIT64xp0NPRU3o4I8phZU+2aX6tHztIQhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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