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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680adaf350067d9baadb89de85c5bd668a34bbdebea375f4368d741e484726a6' 
  AND token = 'bvehV/5d6Sz73Ped5l1km6qXadH2ZZRWQTbJ71Qq/dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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