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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128e93146b4701562e4c61efb107361d48be96f16d4a8d72fcb56245f3bcb711' 
  AND token = '7MmOBzZASVMxnH9nlYLPlUPoBt6q4TE3thncVLPNUbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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