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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18211169df44de0f03d439720d0b69477096dc17d006c66f643f6aee208047c' 
  AND token = 'XBYgUjVw9dpbbQuNP8L0hpB4nzQDrMcU87+XH2fGmYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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