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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0789067022b8c5e3831c3ec95fb7c0c746cec23fcd91599f816f040fe80b9a5' 
  AND token = 'qL2oHtAThjJfNp1VBA4b+Ls+Sqd5mTe6pdcogjSOpAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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