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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e82ff1ea8080105e4623db95b8759c73ffee04acfb4f9bb8fb121b4f87dc21e' 
  AND token = 'JACum88JXnlmgyyB2zu17E1jSIzeHcsoIHI9BlboNIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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