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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b323bf892c2bd7369f3cfda8ecb5a962417995f32f97b03adbd863bb58ed250a' 
  AND token = 'kgGuNQ7fSwsN6HvCEujyTwgoAAi3dfkFrrQ4255a58E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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