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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f687c3be2f0634cf8c249f161693ddb250b29be9a0a3be37234d6a05bb6dc16' 
  AND token = 'Lqg5wNJeau9zLUB34u63SmNqL3tHZWnKbbkwy+jpIuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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