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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5c05b67f234bf0cbf3d89d1adb7e0696e9c94d95d8d3ae9cb3f55aa6f5cec7' 
  AND token = 'MoTKCXzgHR1hgG4WdmSzoB58BjRx2aThySezS/5C5qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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