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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbce7127dcf1df49b95723467c9d9a10fb39a3ba82542ae3c0e0bb52424cfb35' 
  AND token = 'mTW5K5e8iPTyNzXOBXS69iru6jyZheOhxcgZLqow6x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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