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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a014b2b1fff12c47a28d820e20e9dca0182d259b6c2805ae6dc5f14b04559ad' 
  AND token = 'DsK94yWg5UwRupkM5xTR4ucIArRYKhOVmGL733yO8OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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