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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6625c9bf244d204dac0688ed07f0d1109c739d20706f61333ca965ef05a1512' 
  AND token = '6ZhBs0XX6QrBGfAKnPw/stGmhWkPl50dVnTswq7yamY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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