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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8174f67c95852a887012c843ee2f9f0db7ab08e7cf14f981040531ffc710c02c' 
  AND token = 'wsq4LtoV+CkM0lhI/RXiXvFUawuHL4hcm8pKEeTF2+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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