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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e75f44acf35436eb84bc3d7a71fa9981ad2b8fb566966c797ecbbfc8b758f6' 
  AND token = 'K+kMpod0ntr0/EeHZRh/nnShJOJXzVIpa206Q/7aur0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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