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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cd7d5d2e82370196db9df87a9498e5c2c778fe6ee6410e4adebdf1f7890bcd' 
  AND token = '+P2gWVkhzWFshjtCb0NYOtJQ7m/jkXsfC/3VXi7ErTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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