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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9aa58f9d2d2c9c7d1e30f7ddee506eb4b24fcb4b091b453a7cfd360613f7de' 
  AND token = 'Pl9/bqGmElWY77eMPUoo1CbW15VUdfh7fVaEk53Ngj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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