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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ff4ed290ebc375188519c921c924159b51fbd2953039b788e8772d383cc069' 
  AND token = 'KOsx6uV4zxKR4KJfNCXdRHCSRKag+9Z/2ccpFRxNQV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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