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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54394628bcd21bf99366f2ab47c08e8d030e179eb522fedb4a180a60e0c00b39' 
  AND token = 'kiBM0dasUP81fiA49Bdi5gUVv52Vgp6tGxgbRXyK0l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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