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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52313717f58b394b9b892c80c45b21d0a9dceb88cd3367d957ced3d97c3214f4' 
  AND token = 'J5fgp8wxVTInW5ySpHiX+b+VKprds87DrzDOPv3608M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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