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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f01b80b7346790b5e8ea2d73e08a4ec99188d6237bc3fa4c7344f872e4786f3' 
  AND token = 'XrfbrW1dpBZ2jTls0Y1fUmrMR3DaHZAtCcLpQpFQ7n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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