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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c1ce4a35b7b9197a9440abdd5b41da3cf4af3d3b8e8bec09efeb6abf1523d4' 
  AND token = '9/Zt6049TJy+7CVoQVHT4yVACDxoeW5w8c72Qm5uUSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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