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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d24e1bb4958fc3d72340805a9366e72349f548d4f1c6ee005fb30657a765422' 
  AND token = '9cs2+kRKVRFzpM6g2li4i6yantrakHvu/S0Zhp4XxBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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