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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961c585bfc742243e10dfe4900287a1bc5f305a77468a684cca76b25d8c72a1e' 
  AND token = 'pF2g1tO47BLuBHra4H3c2UVjbRHOzu9uMuKhNKppM24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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