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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bea3d4ab21ff8d40614a5370358d563c32d6c73ec38bc7242f46ee2bf49b41' 
  AND token = 'Pve8hIQm/GtTSxEm7dWoz2C2gP1kZ4LmJL840ZGjorA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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