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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e214d6ae70f52ea3c19846dafe4926694a26db9ad90edb30ae538001a4b2e876' 
  AND token = 'VY5n6xaCrVdLqNRo3o7uiR723otODGH3Gr8nWWhY9p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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