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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc994a478284474e441f692f1c36160d85070c802fa5f1a559a3dff7ddfac3c5' 
  AND token = '3TOce678o1y//YKiC5gRvfSR5XsKSoIJ0MoOI/EOuRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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