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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa729d110d030fb95fe872e0a7f4d9882a5fa8e82b4a5e3b72aad1b31d36a1d' 
  AND token = 'tXJAx89cAqZAgsLrcJCIcgBck0nL8H88s0kNRYkKisw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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