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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759a01f4654334b73c787c5d72d97d804848c394e1501b65a54d1b898574ee3a' 
  AND token = 'cXQ0SUTDwkpOksADq976kNhxizG3uRJZlPVUVPSp/FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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