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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b896e650cf2a2ce07e4d106cbf0a57c08c03a18c124f1636ddd0ef37dc4be764' 
  AND token = 'Q+350y2KHf/51syO15Ke4OQ7/ZZrLQhmXwpHC5scOGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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