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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8e8ddab2ac2f85059146701b0150f7c88e1bb9911c189fc4006472930d3354' 
  AND token = 'cxmMDzXIY57ffeKyMemdEWjhm7q9qN04LaHElxC4nlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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