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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662e4afc3f64615ec63d640c29d7784b5055700568bbf6106246068d19084bad' 
  AND token = 't8hsUbcJOAIIP+WExg4ziP6/hhdxbk+Lu/CLqgzBSu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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