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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da911e4f81607b5ff995bd49d3acd312ec5ab21d73af8b2024d5ebb81fb1a786' 
  AND token = 'np5vYrirjG49Hu9gjZ2SfiwopYG2ZAtalS5jtYhrR0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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