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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dd168e0765ab95f4b1d5b0c4e8a50c5e1cd52d1ac63fa75b9953f1533d3a6a' 
  AND token = 'ONiu+LfAGt7qrCkq0O0ez8nRvz6bKBFwNKqJcgrqAsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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