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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5064077d8aa2fcf01065b7e69e476d69a5bca70c962423cbcbee1a9e1109bc3d' 
  AND token = 's/3QK4jJdGkpTHZEifubBNGCYtLkBGiisIZ23Kec8So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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