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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d465d971f82e66454baf1e78d25caaffb51b9e35b713ee757d51e8beed3ccb' 
  AND token = 'lVYPX8eX1ahx+lledfkAx35XKHrXXsLGHqwtAN1v8Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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