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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fef98ba5ef4534da35faf49a6337033dd731410b960f8d9040a9eabbf2d318' 
  AND token = 'WKhdxCcwv6zb+8yti/K6I9xRHyBIUmAbsqBe/yOS9DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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