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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ccebaa46525c64048dd9fa66a510b6025ce37cfcb4c5185533e958dc7dff9a' 
  AND token = 'ty0Sf8lHjZIZ1rwWM2xgWVmAVyVibatiKhEy8c7haYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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