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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f270130e13e15d082bb3b2d598dff9d7e0eac558d2295077cfb1d7427a3b9206' 
  AND token = 'm+eV1V4u8QjBB2RuHZtUpDy7B3errf2tO5Jtj4K0QB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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