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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5b9842eedf832eeeb47612daa9c35313d787409a5cef3e0b51cf06a1cdd9a1' 
  AND token = 'cdSd9n7RrgOmLiH6KfOGePMLcHIQqbE1WSGzbps5j4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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