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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bca01ca4e9639001c0176f8d59e8dc9e174591b93fce3c59f383d8d486cab3' 
  AND token = 'sQIhVd88m+Pdva+Zh/3ojlaXuju3f3qKn6CoWs0qqxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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