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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6889f9f158f66f434a3c1940238b7c95b7a9d072f549acbd1deada702ca5221c' 
  AND token = 'd0va4J9J22ZR+cOrUXT3JrdvWXsWA0ce0e0hmwNQx8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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