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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0925aef016ff6070722c16c3e476388c51d04b5f15c21e4570feb8d9182acd94' 
  AND token = 'L3BWTJbral0iR4fs8/V0oo/CfDvPSVeOkWo0YnoujS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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