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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3d90b6be8fdb5fb2ad3b6e69f64c6c92a663464d4ef07cb972385f51b7ecdb' 
  AND token = 'Vp2r/2MIFtaJVFpJZvTv6Tn4vCIyS91HB/uMQ6XA8wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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