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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023097faa909212e686f9bf4b94a7babd624c0db3b2c46d1d973f7d6c79a7569' 
  AND token = 'C7y6QSo2PHY+3bgtzawF/cagfBP0oMPD3eP8xXdAOS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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