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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adf51bef952d28a2165bc73babf69bfed147d26c94c3efaf0b9f94a64c61ad0' 
  AND token = 'NFy02xSZzX3Hml5HBP6weo36xaXACDCPSI1QgPuxnCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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